CN105115540B - MEMS inertial sensor, humidity sensor integrating device and its manufacturing method - Google Patents

MEMS inertial sensor, humidity sensor integrating device and its manufacturing method Download PDF

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CN105115540B
CN105115540B CN201510369192.8A CN201510369192A CN105115540B CN 105115540 B CN105115540 B CN 105115540B CN 201510369192 A CN201510369192 A CN 201510369192A CN 105115540 B CN105115540 B CN 105115540B
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humidity sensor
common substrate
sensor capacitance
polar plate
fixed polar
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CN105115540A (en
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郑国光
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Goertek Microelectronics Inc
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Abstract

The invention discloses a kind of MEMS inertial sensor, humidity sensor integrating device and its manufacturing methods, movable mass structure includes fixed anchor point on a common substrate, and the movable mass above common substrate is suspended at by anchor point, first humidity sensor capacitance structure, the second humidity sensor capacitance structure respectively include setting at least a pair of first fixed polar plate, the second fixed polar plate on a common substrate, each pair of first fixed polar plate, the second fixed polar plate gap in be filled with humidity-sensitive material;It further includes movable mass structure, the first cover of the first humidity sensor capacitance structure sealing on a common substrate.The integrating device of the present invention, identical MEMS device technique may be used, capacitive MEMS inertia device and humidity sensor is integrated simultaneously on a single chip, cost can be effectively reduced, while MEMS inertia devices and the occupied chip area of humidity sensor can also be greatly reduced.

Description

MEMS inertial sensor, humidity sensor integrating device and its manufacturing method
Technical field
The present invention relates to field of sensor measurement, more particularly, to the integrating device more particularly to one kind of a kind of sensor The integrating device of MEMS inertial sensor, humidity sensor;The invention further relates to a kind of manufacturing methods of integrating device.
Background technology
In recent years, with the development of science and technology, the volume of the electronic products such as mobile phone, laptop is constantly reducing, And people are also higher and higher to the performance requirement of these portable electronic products, and this requires matched electronic components Volume must also reduce therewith.
Sensor has been commonly utilized on the electronic products such as mobile phone, laptop, numerous systems as measurement device Manufacturer wishes that these measurement devices on the basis of existing performance is kept, further reduce the size of chip, to adapt to this kind of electricity The miniaturization of sub- product.But in existing process structure, MEMS inertia devices and humidity sensor be not mostly using Same technological process, so the detection of inertial signal and moisture signal can only be realized respectively by two different chips, this The cost of manufacture is not only increased, while also increases the usable floor area of chip.And the manufacturing process of present each sensor is Through comparative maturity, technological ability is already close to the limit, it is difficult to which the requirement further according to system manufacturer further reduces the size of chip.
Invention content
It is an object of the present invention to provide the new technology sides of a kind of MEMS inertial sensor, humidity sensor integrating device Case.
According to the first aspect of the invention, a kind of MEMS inertial sensor, humidity sensor integrating device are provided, including Common substrate is equipped with the movable mass structure for inertial sensor, the movable mass knot in the common substrate Structure includes the anchor point fixed on a common substrate and is suspended at the movable mass above common substrate by anchor point, in institute It states and the first humidity sensor capacitance structure, the second humidity sensor capacitance structure is additionally provided in common substrate, wherein described first Humidity sensor capacitance structure, the second humidity sensor capacitance structure respectively include setting at least a pair of the on a common substrate One fixed polar plate, the second fixed polar plate, each pair of first fixed polar plate, the second fixed polar plate gap in be filled with wet sensitive Material;Further include first movable mass structure, the first humidity sensor capacitance structure is sealed in the common substrate Cover;The second humidity sensor capacitance structure is in communication with the outside.
Preferably, wherein, the first humidity sensor capacitance structure has phase with the second humidity sensor capacitance structure Same initial capacitance value.
Preferably, the first humidity sensor capacitance structure has identical with the second humidity sensor capacitance structure Structure.
Preferably, be additionally provided with the second lid the second humidity sensor capacitance structure being encapsulated in the common substrate Body, wherein, it is provided with through hole in second cover.
Preferably, it is provided with insulating layer between the anchor point, the first fixed polar plate, the second fixed polar plate and common substrate.
Preferably, the anchor point, movable mass and the first fixed polar plate, the second fixed polar plate are in the common substrate It is upper that there is identical height.
The present invention also provides a kind of manufacturing methods of above-mentioned integrating device, include the following steps:
A) depositing insulating layer, and being performed etching to the insulating layer on a common substrate, the movement for forming movable mass are empty Between;
B) MEMS structure layer is bonded in the upper end of insulating layer;
C) MEMS structure layer is performed etching, forms at least a pair of first fixed polar plate, at least a pair of second fixed polar plate;
D) respectively the first fixed polar plate, the second fixed polar plate gap in fill humidity-sensitive material, form the first humidity and pass Sensor capacitance structure, the second humidity sensor capacitance structure;
E) continue to etch MEMS structure layer, form the anchor point and movable mass of movable mass structure, and by first Humidity sensor capacitance structure, the second humidity sensor capacitance structure, movable mass structure separate;
F) the first cover is bonded in MEMS structure layer, by movable mass structure, the first humidity sensor capacitance Sealing structure is in the common substrate.
Preferably, first cover by metal bonding in MEMS structure layer.
Preferably, before the step c), the step of MEMS structure layer is thinned to predetermined thickness is further included.
Preferably, it in the step f), further includes and the second cover with through hole is bonded in MEMS structure layer, The second humidity sensor capacitance structure to be encapsulated in the step in the common substrate.
In the integrating device of the present invention, the first humidity sensor capacitance structure is due to being sealed in the first cover and common substrate In the closed containing cavity surrounded, make it insensitive to extraneous humidity variation, and the second humidity sensor capacitance structure is due to exposure In the external world, it is made to change extraneous humidity sensitive.First humidity sensor capacitance structure and the second humidity sensor electricity as a result, Hold structure and may be constructed a pair of of differential capacitance structure.Two humidity sensor capacitance structures can generate extraneous common mode interference Basically identical response, in this way, can be filtered out at least partly using the output signal of the first humidity sensor capacitance structure Common mode interference signal in second humidity sensor capacitance structure output signal, and then the second humidity sensor capacitance can be improved The stability and resolution ratio of structure output signal.
The integrating device of the present invention, may be used identical MEMS device technique, by capacitive MEMS inertia device and wet It is integrated simultaneously on a single chip to spend sensor, cost can be effectively reduced, while MEMS inertia devices can also be greatly reduced Part and the occupied chip area of humidity sensor.
It was found by the inventors of the present invention that in the prior art, MEMS inertia devices and humidity sensor are mostly using difference Technological process, so by two different chips the detection of inertial signal and moisture signal can only be realized respectively, this is not But the cost of manufacture is increased, while also increases the usable floor area of chip.Therefore, the technical assignment to be realized of the present invention or It is that person never expects the technical problem to be solved is that those skilled in the art or it is not expected that, therefore the present invention is a kind of New technical solution.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its Advantage will become apparent.
Description of the drawings
It is combined in the description and the attached drawing of a part for constitution instruction shows the embodiment of the present invention, and even With its explanation together principle for explaining the present invention.
Fig. 1 is the sectional view of integrating device of the present invention.
Fig. 2 to Fig. 6 is the manufacturing process flow diagram of integrating device in Fig. 1.
Fig. 7 is the sectional view of integrating device another embodiment of the present invention.
Specific embodiment
Carry out the various exemplary embodiments of detailed description of the present invention now with reference to attached drawing.It should be noted that:Unless in addition have Body illustrates that the unlimited system of component and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally The range of invention.
It is illustrative to the description only actually of at least one exemplary embodiment below, is never used as to the present invention And its application or any restrictions that use.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable In the case of, the technology, method and apparatus should be considered as part of specification.
In shown here and discussion all examples, any occurrence should be construed as merely illustrative, without It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that:Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, then in subsequent attached drawing does not need to that it is further discussed.
Referring to figs. 1 to Fig. 6, the present invention provides a kind of MEMS inertial sensor, humidity sensor integrating device, including Common substrate 1 is equipped with the movable mass structure 7 for inertial sensor, the movable mass in the common substrate 1 Structure 7 include the anchor point 71 that is fixed in common substrate 1 and by anchor point 71 be suspended at 1 top of common substrate can kinoplaszm Gauge block 70.Movable mass structure 7 is the important component of inertial sensor, is connected on anchor point 71 by elastic torsion-beam, and Movable mass 70 is made to be suspended at the top of common substrate 1, is equipped between movable mass 70 and common substrate 1 and supplies movable quality The space 8 that block 70 moves.When by the inertia force of respective direction, movable mass 70 can occur to move accordingly, so as to logical The capacitance structure of composition is crossed to characterize the inertia force suffered by movable mass 70.In the present invention, inertial sensor can be top Spiral shell instrument, accelerometer etc., specific structure, operation principle belong to the common knowledge of those skilled in the art, no longer have herein Body explanation.
The first humidity sensor capacitance structure 5, the second humidity sensor capacitance structure are additionally provided in the common substrate 1 6, wherein, the first humidity sensor capacitance structure 5 includes being fixed at least a pair of first fixed polar plate in common substrate 1 50, there is between two the first fixed polar plates 50 gap 50a, humidity-sensitive material 51 is filled in the gap 50a.Humidity sensor Structure, the operation principle of device belong to the common knowledge of those skilled in the art, wherein, humidity-sensitive material 51 can be nanofiber Body can be obtained by plasma bombardment polymer material, and plasma can be oxygen plasma, argon plasma, gather It can be polyimides, positive photoresist, negative photoresist, dimethyl silicone polymer, Parylene or other micro- electricity to close object material The sub- common polymer material of technique.When humidity sensor works, humidity-sensitive material 51 can adsorb the hydrone in air so that Dielectric constant between two the first fixed polar plates 50 changes, the capacitance for thus being formed two the first fixed polar plates 50 Value change, realize the measurement of air humidity.
Wherein, in order to improve the precision of output signal, multipair first fixed polar plate 50 can be set, to form multiple detections Capacitance structure, multiple detection capacitance structure may be constructed the differential capacitance structure of the first humidity sensor.
Based on identical reason, the second humidity sensor capacitance structure 6 includes being fixed in common substrate 1 at least A pair of second fixed polar plate 60 has gap 60a between two the second fixed polar plates 60, filled with wet in the gap 60a Quick material 61.
The integrating device of the present invention, further includes the first cover 3 being encapsulated in common substrate 1, to form closed cavity volume 10, wherein, the movable mass structure 7, the first humidity sensor capacitance structure 5 are located in the cavity volume 10, that is to say, that The movable mass structure 7, the first humidity sensor capacitance structure 5 are sealed in common substrate 1 by the first cover 3, So that the first humidity sensor capacitance structure 5 is isolated from the outside and comes, that is to say, that the first humidity sensor capacitance structure 5 will not export corresponding capacitance with the variation of ambient humidity.And the second humidity sensor capacitance structure 6 then directly exposure In the external world so that the second humidity sensor capacitance structure 6 can export corresponding capacitance with the variation of ambient humidity, with Realize the detection to ambient humidity.
In the integrating device of the present invention, the first humidity sensor capacitance structure 5 is due to being sealed in the first cover 3 with sharing lining In the closed containing cavity 10 that bottom 1 surrounds, make it insensitive to extraneous humidity variation, and the second humidity sensor capacitance structure 6 by In being exposed to the external world, it is made to change extraneous humidity sensitive.First humidity sensor capacitance structure 5 and the second humidity as a result, Sensor capacitance structure 6 may be constructed a pair of of differential capacitance structure.The extraneous common mode of 5,6 pairs of two humidity sensor capacitance structures Interference can generate basically identical response, in this way, the output signal using the first humidity sensor capacitance structure 5 can be down to The common mode interference signal in 6 output signal of the second humidity sensor capacitance structure is partially filtered out, and then second can be improved The stability and resolution ratio of 6 output signal of humidity sensor capacitance structure.
In another embodiment of the present invention, it is additionally provided in the common substrate 1 by the second humidity sensor capacitive junctions Structure 6 is encapsulated in the second cover 9 in common substrate 1, with reference to figure 7, wherein, through hole 90 is provided in second cover 9, is made It obtains the second humidity sensor capacitance structure 6 to be in communication with the outside, to be detected extraneous humidity.Using the second cover 9, the influence that particle and other pollutants are fixed in external environment to the second humidity sensor capacitance structure 6 can be effectively reduced, Meanwhile second cover 9 certain shielding action can also be played to extraneous electromagnetic interference, make the second humidity sensor capacitive junctions The output of structure 6 is more stablized, signal-to-noise ratio higher.
In a specific embodiment of the invention, preferably described first humidity sensor capacitance structure 5 and second wet Spending sensor capacitance structure 6 has identical initial capacitance value.In order to ensure that the first humidity sensor capacitance structure 5 and second is wet It is basically identical to the response of extraneous common mode interference to spend sensor capacitance structure 6, farthest to filter out the second humidity sensor It is wet to second to eliminate 5 output signal of the first humidity sensor capacitance structure for common mode interference signal in 6 output signal of capacitance structure Spend the influence of the useful signal in 6 output signal of sensor capacitance structure, the first humidity sensor capacitance structure 5 and second wet Spending sensor capacitance structure 6 has identical structure, makes the first humidity sensor capacitance structure 5 and the second humidity sensor capacitance Both structure 6 has an essentially identical initial capacitance value, which the includes material of corresponding part, shape, size and Forming position etc..
The integrating device of the present invention, anchor point 71, movable mass 70, the first fixed polar plate 50, the second fixed polar plate 60 can To use single crystal silicon material, this allows for produce on the same MEMS structure layer a being made of single crystal silicon material above-mentioned Structure.Wherein, convenient for technique, anchor point 71, movable mass 70, the first fixed polar plate 50, the second fixed polar plate 60 exist There is identical height in common substrate 1.It may further be preferable that in order to ensure to insulate, anchor point 71, the first fixed polar plate 50, Insulating layer 2 is provided between second fixed polar plate 60 and common substrate 1.
The present invention also provides a kind of manufacturing methods of integrating device, include the following steps:
A) layer insulating 2 is deposited in common substrate 1, and the insulating layer 2 is performed etching, forms movable mass Space 8, with reference to figure 2;Wherein, earth silicon material may be used in insulating layer 2.
B) MEMS structure layer a is bonded in the upper end on insulating layer 2, with reference to figure 3;Wherein, MEMS structure layer a can be single Crystal silicon material can be bonded in by mode well-known to those skilled in the art on insulating layer 2.
C) MEMS structure layer a is performed etching, forms the first humidity sensor capacitance structure 5, the second humidity sensor electricity Hold the fixed polar plate of structure 6;Specifically, it with reference to figure 4, is performed etching in the corresponding position of MEMS structure layer a, to form at least one To the first fixed polar plate 50, at least a pair of second fixed polar plate 60, between each pair of first fixed polar plate 50, the second fixed polar plate 60 It is respectively equipped with gap 50a, 60a.
These, it is preferred to before this step, further include the step of MEMS structure layer a is thinned to predetermined thickness. That is in step b), thicker MEMS structure layer a is selected to be bonded on insulating layer 2, it is suitable to be thinned to again later Thickness.In this way, it can prevent from damaging MEMS structure layer a in bonding process.
D) humidity-sensitive material 51,61 is filled in gap 50a, 60a, to form the first humidity sensor capacitance structure 5, the Two humidity sensor capacitance structures 6, with reference to figure 5.
E) continue to etch MEMS structure layer a, form the anchor point 71 of movable mass structure 7 and movable mass 70, and First humidity sensor capacitance structure 5, the second humidity sensor capacitance structure 6, movable mass structure 7 are separated, referred to Fig. 6;
F) the first cover 3 is bonded on MEMS structure layer a, by movable mass structure 7, the first humidity sensor electricity Hold structure 5 to be sealed in the common substrate 1, form integrating device as shown in Figure 1.
In a preferred embodiment is invented, metal 4 is additionally provided with, first cover 3 is bonded in by metal 4 On MEMS structure layer a.It may further be preferable that in above-mentioned steps f), further include 9 key of the second cover with through hole 90 It closes on MEMS structure layer a, the second humidity sensor capacitance structure 6 is encapsulated in the step in the common substrate 1.
The integrating device of the present invention, may be used identical MEMS device technique, by capacitive MEMS inertia device and wet It is integrated simultaneously on a single chip to spend sensor, cost can be effectively reduced, while MEMS inertia devices can also be greatly reduced Part and the occupied chip area of humidity sensor.
Although some specific embodiments of the present invention are described in detail by example, the skill of this field Art personnel it should be understood that example above merely to illustrating, the range being not intended to be limiting of the invention.The skill of this field Art personnel are it should be understood that can without departing from the scope and spirit of the present invention modify to above example.This hair Bright range is defined by the following claims.

Claims (8)

1. a kind of MEMS inertial sensor, humidity sensor integrating device, it is characterised in that:Including common substrate (1), described Common substrate (1) is equipped with the movable mass structure (7) for inertial sensor, and the movable mass structure (7) includes The anchor point (71) that is fixed in common substrate (1) and the movable quality above common substrate (1) is suspended at by anchor point (71) Block (70) is additionally provided with the first humidity sensor capacitance structure (5), the second humidity sensor capacitance in the common substrate (1) Structure (6), wherein the first humidity sensor capacitance structure (5), the second humidity sensor capacitance structure (6) respectively include setting At least a pair of first fixed polar plate (50) for putting in common substrate (1) and obtaining to same MEMS structure layer (a) etching, the Two fixed polar plates (60), each pair of first fixed polar plate (50), the second fixed polar plate (60) gap (50a, 60a) in fill out Humidity-sensitive material (51,61) filled with phase same material;It further includes movable mass structure (7), the first humidity sensor capacitive junctions Structure (5) is sealed in the first cover (3) in the common substrate (1);The second humidity sensor capacitance structure (6) and the external world Connection;
Wherein, the first humidity sensor capacitance structure (5) and the second humidity sensor capacitance structure (6) have it is identical just Beginning capacitance, the first humidity sensor capacitance structure (5) have identical with the second humidity sensor capacitance structure (6) Structure.
2. integrating device according to claim 1, it is characterised in that:It is additionally provided with the second humidity sensor capacitance structure (6) the second cover (9) being encapsulated in the common substrate (1), wherein, it is provided with through hole on second cover (9) (90)。
3. integrating device according to claim 1, it is characterised in that:The anchor point (71), the first fixed polar plate (50), Insulating layer (2) is provided between two fixed polar plates (60) and common substrate (1).
4. integrating device according to claim 3, it is characterised in that:The anchor point (71), movable mass (70) and First fixed polar plate (50), the second fixed polar plate (60) have identical height in the common substrate (1).
5. a kind of manufacturing method of integrating device as described in claim 1, which is characterized in that include the following steps:
A) depositing insulating layer (2) in common substrate (1), and the insulating layer (2) is performed etching, form the fortune of movable mass Dynamic space (8);
MEMS structure layer (a) b) is bonded in the upper end of insulating layer (2);
C) MEMS structure layer (a) is performed etching, forms at least a pair of first fixed polar plate (50), at least a pair of second fixed pole Plate (60);
D) respectively in the interior filling humidity-sensitive material in the gap (50a, 60a) of the first fixed polar plate (50), the second fixed polar plate (60) (51,61) form the first humidity sensor capacitance structure (5), the second humidity sensor capacitance structure (6);
E) continue to etch MEMS structure layer (a), form the anchor point (71) and movable mass of movable mass structure (7) (70), and by the first humidity sensor capacitance structure (5), the second humidity sensor capacitance structure (6), movable mass structure (7) it separates;
F) the first cover (3) is bonded in MEMS structure layer (a), by movable mass structure (7), the first humidity sensor Capacitance structure (5) is sealed in the common substrate (1).
6. manufacturing method according to claim 5, it is characterised in that:First cover (3) is bonded in by metal (4) In MEMS structure layer (a).
7. manufacturing method according to claim 5, it is characterised in that:Before the step c), further include and tie MEMS Structure layer (a) is thinned to the step of predetermined thickness.
8. manufacturing method according to claim 5, it is characterised in that:In the step f), further including will be with perforation Second cover (9) in hole (90) is bonded in MEMS structure layer (a), and the second humidity sensor capacitance structure (6) is encapsulated in Step on the common substrate (1).
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CN111561928A (en) * 2020-05-18 2020-08-21 无锡市伍豪机械设备有限公司 MEMS inertial sensor and manufacturing method and control system thereof
CN115727839A (en) * 2021-08-31 2023-03-03 华为技术有限公司 Inertial sensor and electronic device
CN114440879A (en) * 2022-01-27 2022-05-06 西人马联合测控(泉州)科技有限公司 Sensor chip and preparation method thereof

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